Rock Identifier

Category

Igneous Or Sedimentary (Water Worn)

Browse igneous or sedimentary (water worn) specimens identified by the Rock Identifier community.

Learn about Igneous Or Sedimentary (Water Worn) in the encyclopedia

Water Opal

Enhydro Quartz

Carbonatite

Clear Beryl

Ice Opal

Hyalite Opal

Iolite

Conglomerate

Jelly Opal

Clear Obsidian

Coldwater Agate

Clear Tourmaline

Clear Tourmaline

Citrine or Yellow Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Citrine or Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Banded Gneiss (Gneiss (High-grade Regional Metamorphic Rock)) — metamorphic

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

River Pebble (Quartzo-feldspathic rock fragment) — sedimentary

River Pebble

Quartzo-feldspathic rock fragment

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Banded Gneiss River Pebble (Gneiss) — metamorphic

Banded Gneiss River Pebble

Gneiss

Quartz Pebble (Chalcedony/Agate variety) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

River Pebble (Polished Quartzite or Mixed Lithology) — sedimentary

River Pebble

Polished Quartzite or Mixed Lithology

Alkali Basalt with iron oxidation (Mafic Volcanic Rock (Fe-bearing Basalt)) — igneous

Alkali Basalt with iron oxidation

Mafic Volcanic Rock (Fe-bearing Basalt)

Unidentified dark pebble (Unknown) — rock

Unidentified dark pebble

Unknown

Quartz Cobble (River Pebble) (Quartz (Silicon Dioxide - SiO2)) — mineral

Quartz Cobble (River Pebble)

Quartz (Silicon Dioxide - SiO2)

Basalt Pebble (Basalt) — igneous

Basalt Pebble

Basalt

Apache Tear (Obsidian (Hydrated Silica Glass)) — igneous

Apache Tear

Obsidian (Hydrated Silica Glass)

River Stone (likely Basalt or Greywacke) (Basalt with mineral veining) — igneous

River Stone (likely Basalt or Greywacke)

Basalt with mineral veining

Chalcedony Pebble with Jasper/Iron Oxide Cortex (Silicon Dioxide (SiO2)) — mineral

Chalcedony Pebble with Jasper/Iron Oxide Cortex

Silicon Dioxide (SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Jasper and Basalt River Pebble (Silica-rich volcanic rock with iron oxide staining) — igneous

Jasper and Basalt River Pebble

Silica-rich volcanic rock with iron oxide staining

Granite Pebble (Granite) — igneous

Granite Pebble

Granite

Basalt (Basalt) — igneous

Basalt

Basalt

Porphyritic Basalt (Basalt (with plagioclase or k-feldspar phenocrysts)) — igneous

Porphyritic Basalt

Basalt (with plagioclase or k-feldspar phenocrysts)

Basalt (Basalt (composition of plagioclase feldspar and pyroxene)) — Igneous

Basalt

Basalt (composition of plagioclase feldspar and pyroxene)

Shiva Lingam (Cryptocrystalline Quartz (Jasper/Agate)) — sedimentary

Shiva Lingam

Cryptocrystalline Quartz (Jasper/Agate)

River Stone (River Pebbles) (Alluvial Deposit (typically Quartzite, Sandstone, or Granite clasts)) — sedimentary

River Stone (River Pebbles)

Alluvial Deposit (typically Quartzite, Sandstone, or Granite clasts)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Chert (Jasper) (Sedimentary Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper)

Sedimentary Cryptocrystalline Quartz (SiO2)

Quartz Pebble (Quartz (Silicon Dioxide, SiO2)) — sedimentary

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Sandstone (Quartzose) (Arenite (Formula: SiO2 primary, with various cements)) — sedimentary

Sandstone (Quartzose)

Arenite (Formula: SiO2 primary, with various cements)

Yellow Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Chert (with Quartz Vein) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (with Quartz Vein)

Microcrystalline Quartz (SiO2)

Yellow Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Crystalline Silica (SiO2)) — mineral

Quartz Pebble

Crystalline Silica (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Porphyritic Basalt (with Olivine or Quartz phenocryst) (Porphyritic Basalt (Mafic Extrusive)) — igneous

Porphyritic Basalt (with Olivine or Quartz phenocryst)

Porphyritic Basalt (Mafic Extrusive)

Small rounded stone, likely basalt or weathered mafic rock (Fine-grained basalt; exact identification requires testing) — igneous

Small rounded stone, likely basalt or weathered mafic rock

Fine-grained basalt; exact identification requires testing

Jasper Pebble (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper Pebble

Microcrystalline Quartz (SiO2)

Yellow Jasper (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (Jasper/Agate variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Chert (Jasper variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Quartz Pebble (Iron-Stained Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (Iron-Stained Quartz)

Silicon Dioxide (SiO2)

Yellow Agate (Chalcedony (cryptocrystalline Quartz), SiO2) — mineral

Yellow Agate

Chalcedony (cryptocrystalline Quartz), SiO2

Yellow Chert Pebbles/Yellow Jasper (Microcrystalline Quartz (SiO2) with Goethite or Limonite inclusions) — sedimentary

Yellow Chert Pebbles/Yellow Jasper

Microcrystalline Quartz (SiO2) with Goethite or Limonite inclusions

Granite (Intrusive igneous rock (Granite)) — igneous

Granite

Intrusive igneous rock (Granite)